distinct

I'd really appreciate it if someone could validate my SQL query. For the following dataset: MD5 UserPK CategoryPK ADCDE 1 7 ADCDE 1 4 ADCDE 1 7 dffrf 1 7 dffrf 2 7 dffrf 2 6 dffrf 1 1 I'd like to select MD5 and CategoryPK where two or more rows exist with identical MD5 values, identical CatgegoryPK and two or more DIFFERENT UserPK values. In other words, I'd like to know the MD5 and categoryPK of all records where two or more different users (UserPK) have assigned the same category (UserPK) to the same file (Md5). I'm not interested in records the same user has assigned the category to

I have a Dictionary with doubles as values and strings as keys. I want to count occurrences of each value in this Dictionary and I want to know this value (that is for instance repeated). for instance: key1, 2 key2, 2 key3, 3 key4, 2 key5, 5 key6, 5 I want to get a list: 2 - 3 (times) 3 - 1 (once) 5 - 2 (twice) How can I do it? The first thing to note, is that you don't actually care about the keys of the dictionary. Step one therefore is to ignore them as irrelevant to the task in hand. We're going to work with the Values property of the dictionary, and the work is much the same as for any

Until recently, I was using a Distinct in LINQ to select a distinct category (an enum) from a table. This was working fine. I now need to have it distinct on a class containing a category and country (both enums). The Distinct isn't working now. What am I doing wrong? Stilgar I believe this post explains your problem: http://blog.jordanterrell.com/post/LINQ-Distinct()-does-not-work-as-expected.aspx The content of the above link can be summed up by saying that the Distinct() method can be replaced by doing the following. var distinctItems = items .GroupBy(x => x.PropertyToCompare) .Select(x =>

I have two models class Employer(models.Model): name = models.CharField(max_length=300, blank=False) id = models.IntegerField() status = models.IntegerField() eminence = models.IntegerField(null=False,default=4) class JobTitle(models.Model) name = models.CharField(max_length=300, blank=False) employer = models.ForeignKey(Employer,unique=False,null=True) activatedate = models.DateTimeField(default=datetime.datetime.now) I need all employers in the order of whose jobtitle activated last. Employer.objects.filter(status=1).order_by('eminence','-jobtitle__activatedate') This query gives me what I

Does SQL Server support IS DISTINCT FROM statement which is SQL:1999 standard? E.g. the query SELECT * FROM Bugs WHERE assigned_to IS NULL OR assigned_to <> 1; can be rewritten using IS DISTINCT FROM SELECT * FROM Bugs WHERE assigned_to IS DISTINCT FROM 1; No, it doesn't. The following SO question explains how to rewrite them into equivalent (but more verbose) SQL Server expressions: How to rewrite IS DISTINCT FROM and IS NOT DISTINCT FROM? There's also a Uservoice entry for this issue, where you can vote for inclusion in the next release: Add language and optimizer support for ISO <distinct

Given this code: dgIPs.DataSource = from act in Master.dc.Activities where act.Session.UID == Master.u.ID select new { Address = act.Session.IP.Address, Domain = act.Session.IP.Domain, FirstAccess = act.Session.IP.FirstAccess, LastAccess = act.Session.IP.LastAccess, IsSpider = act.Session.IP.isSpider, NumberProblems = act.Session.IP.NumProblems, NumberSessions = act.Session.IP.Sessions.Count() }; How do I pull the Distinct() based on distinct Address only? That is, if I simply add Distinct(), it evaluates the whole row as being distinct and thusly fails to find any duplicates. I want to return